WO2017188652A1 - 영상 부호화/복호화 방법 및 장치 - Google Patents

영상 부호화/복호화 방법 및 장치 Download PDF

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WO2017188652A1
WO2017188652A1 PCT/KR2017/004192 KR2017004192W WO2017188652A1 WO 2017188652 A1 WO2017188652 A1 WO 2017188652A1 KR 2017004192 W KR2017004192 W KR 2017004192W WO 2017188652 A1 WO2017188652 A1 WO 2017188652A1
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Prior art keywords
block
sample
current block
intra prediction
prediction
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PCT/KR2017/004192
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English (en)
French (fr)
Korean (ko)
Inventor
심동규
류호찬
안용조
Original Assignee
인텔렉추얼디스커버리 주식회사
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Priority claimed from KR1020160051048A external-priority patent/KR102646642B1/ko
Priority claimed from KR1020160051058A external-priority patent/KR20170122351A/ko
Priority claimed from KR1020160054610A external-priority patent/KR20170125155A/ko
Priority to CN202111349439.1A priority Critical patent/CN114189681A/zh
Priority to CN202111347573.8A priority patent/CN114189679A/zh
Priority to US16/096,704 priority patent/US11368682B2/en
Priority to CN202111347576.1A priority patent/CN114189680A/zh
Priority to EP21171150.2A priority patent/EP3968634A1/en
Application filed by 인텔렉추얼디스커버리 주식회사 filed Critical 인텔렉추얼디스커버리 주식회사
Priority to CN202111347572.3A priority patent/CN114189678A/zh
Priority to CN201780038491.0A priority patent/CN109417637B/zh
Priority to EP17789837.6A priority patent/EP3451668A4/en
Priority to CN202111349451.2A priority patent/CN114189682A/zh
Publication of WO2017188652A1 publication Critical patent/WO2017188652A1/ko
Priority to US17/747,309 priority patent/US11882275B2/en
Priority to US18/351,775 priority patent/US20230362365A1/en
Priority to US18/537,375 priority patent/US20240205393A1/en

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Definitions

  • the present invention relates to a method and apparatus for encoding / decoding a video signal.
  • High efficiency image compression techniques can be used to solve these problems caused by high resolution and high quality image data.
  • An inter-screen prediction technique for predicting pixel values included in the current picture from a picture before or after the current picture using an image compression technique an intra prediction technique for predicting pixel values included in a current picture using pixel information in the current picture
  • the present invention seeks to improve the compression efficiency of inter prediction.
  • the present invention seeks to improve the compression efficiency of intra prediction.
  • the present invention provides an inter prediction method and apparatus based on the current picture reference mode.
  • the present invention provides a method and apparatus for deriving a motion vector for the current picture reference mode.
  • the present invention provides a method and apparatus for determining an encoding / decoding order of a subblock belonging to a current block in consideration of an intra prediction mode of the current block.
  • the present invention provides a method and apparatus for generating a reference sample for intra prediction based on an interpolation filter.
  • the present invention provides a method and apparatus for determining an interpolation filter applied to a surrounding sample in consideration of at least one of a block size or an intra prediction mode.
  • the efficiency of inter prediction may be improved based on the current picture reference mode.
  • the efficiency of intra prediction may be improved based on an adaptive encoding / decoding sequence.
  • FIG. 1 is a block diagram illustrating an image encoding apparatus according to an embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating an image decoding apparatus according to an embodiment of the present invention.
  • FIG. 3 illustrates an intra prediction based on a fixed scan order as an embodiment to which the present invention is applied.
  • FIG. 4 illustrates an intra prediction method based on an adaptive scan order as an embodiment to which the present invention is applied.
  • FIG. 5 illustrates an example of a category relating to a scanning order as an embodiment to which the present invention is applied.
  • FIG. 6 illustrates an intra prediction process according to a z scan in an adaptive scan order according to an embodiment to which the present invention is applied.
  • FIG. 7 illustrates an intra prediction process according to a z-scan rotated 90 degrees counterclockwise in an adaptive scan sequence according to an embodiment to which the present invention is applied.
  • FIG. 8 illustrates an intra prediction process according to a z scan rotated 90 degrees clockwise in an adaptive scan order according to an embodiment to which the present invention is applied.
  • FIG. 9 illustrates an inter prediction method based on a current picture reference mode according to an embodiment to which the present invention is applied.
  • FIG. 10 illustrates a method of deriving a motion vector of a current block encoded in the current picture reference mode according to an embodiment to which the present invention is applied.
  • FIG. 11 illustrates a method of filtering a reference block according to an embodiment to which the present invention is applied.
  • FIG. 12 illustrates a form of a current block coded in a current picture reference mode according to an embodiment to which the present invention is applied.
  • FIG. 13 illustrates an interpolation based intra prediction process according to an embodiment to which the present invention is applied.
  • FIG. 14 illustrates a method of applying an interpolation filter as an embodiment to which the present invention is applied.
  • FIG. 15 illustrates an example of an interpolation filter using a plurality of taps as an embodiment to which the present invention is applied.
  • the intra prediction method determines an intra prediction mode of a current block, and determines a scan order for a plurality of sub-blocks belonging to the current block based on the determined intra prediction mode, and determines the determined scan order. Based on this, intra prediction of the current block may be performed.
  • the inter prediction method derives a motion vector of a current block, determines a reference block of the current block based on the motion vector of the current block, and compensates for the motion of the current block based on the determined reference block.
  • the reference block may belong to the same picture as the current block.
  • Intra prediction method by specifying a neighboring sample for intra prediction of the current block, performing a predetermined filtering on the specified neighboring sample, applying an interpolation filter to the filtered neighboring sample to perform the intra prediction
  • a reference sample may be generated, and intra prediction of the current block may be performed based on the generated reference sample.
  • the image encoding / decoding apparatus determines an intra prediction mode of a current block, determines a scan order for a plurality of subblocks belonging to the current block based on the determined intra prediction mode, and determines the determined scan order. It may include an intra prediction unit for performing intra prediction of the current block based on.
  • the image encoding / decoding apparatus derives a motion vector of a current block, determines a reference block of the current block based on the motion vector of the current block, and determines the reference block of the current block based on the determined reference block.
  • An inter prediction unit that performs motion compensation, wherein the reference block may belong to the same picture as the current block.
  • the image encoding / decoding apparatus specifies a surrounding sample for intra prediction of a current block, performs a predetermined filtering on the specified surrounding sample, and applies an interpolation filter to the filtered neighboring sample.
  • An intra prediction unit may be generated to generate a reference sample for prediction and perform intra prediction of the current block based on the generated reference sample.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • FIG. 1 is a block diagram illustrating an image encoding apparatus according to an embodiment of the present invention.
  • the image encoding apparatus 100 may include a picture splitter 110, a predictor 120 and 125, a transformer 130, a quantizer 135, a realigner 160, and an entropy encoder. 165, an inverse quantizer 140, an inverse transformer 145, a filter 150, and a memory 155.
  • each of the components shown in FIG. 1 is independently illustrated to represent different characteristic functions in the image encoding apparatus, and does not mean that each of the components is made of separate hardware or one software component unit.
  • each component is included in each component for convenience of description, and at least two of the components may be combined into one component, or one component may be divided into a plurality of components to perform a function.
  • Integrated and separate embodiments of the components are also included within the scope of the present invention without departing from the spirit of the invention.
  • the components may not be essential components for performing essential functions in the present invention, but may be optional components for improving performance.
  • the present invention can be implemented including only the components essential for implementing the essentials of the present invention except for the components used for improving performance, and the structure including only the essential components except for the optional components used for improving performance. Also included in the scope of the present invention.
  • the picture dividing unit 110 may divide the input picture into at least one block.
  • the block may mean a coding unit (CU), a prediction unit (PU), or a transformation unit (TU).
  • the partitioning may be performed based on at least one of a quadtree or a binary tree.
  • Quad tree is a method of dividing an upper block into lower blocks having a width and a height of half of the upper block.
  • the binary tree divides the upper block into lower blocks, which are half of the upper block in either width or height.
  • the upper block is half-height through the above-described binary tree-based partitioning, so that the block may have a square as well as a non-square shape.
  • a coding unit may be used as a unit for encoding or may be used as a unit for decoding.
  • the predictors 120 and 125 may include an inter predictor 120 that performs inter prediction and an intra predictor 125 that performs intra prediction. Whether to use inter prediction or intra prediction on the prediction unit may be determined, and specific information (eg, an intra prediction mode, a motion vector, a reference picture, etc.) according to each prediction method may be determined. In this case, the processing unit in which the prediction is performed may differ from the processing unit in which the prediction method and the details are determined. For example, the method of prediction and the prediction mode may be determined in the prediction unit, and the prediction may be performed in the transform unit. The residual value (residual block) between the generated prediction block and the original block may be input to the transformer 130.
  • specific information eg, an intra prediction mode, a motion vector, a reference picture, etc.
  • prediction mode information and motion vector information used for prediction may be encoded by the entropy encoder 165 together with the residual value and transmitted to the decoder.
  • the original block may be encoded as it is and transmitted to the decoder without generating the prediction block through the prediction units 120 and 125.
  • the inter prediction unit 120 may predict the prediction unit based on the information of at least one of the previous picture or the next picture of the current picture. In some cases, the inter prediction unit 120 may predict the prediction unit based on the information of the partial region in which the current picture is encoded. You can also predict units.
  • the inter predictor 120 may include a reference picture interpolator, a motion predictor, and a motion compensator.
  • the reference picture interpolator may receive reference picture information from the memory 155 and generate pixel information of an integer pixel or less in the reference picture.
  • a DCT based 8-tap interpolation filter having different filter coefficients may be used to generate pixel information of integer pixels or less in units of 1/4 pixels.
  • a DCT-based interpolation filter having different filter coefficients may be used to generate pixel information of an integer pixel or less in units of 1/8 pixels.
  • the motion predictor may perform motion prediction based on the reference picture interpolated by the reference picture interpolator.
  • various methods such as full search-based block matching algorithm (FBMA), three step search (TSS), and new three-step search algorithm (NTS) may be used.
  • FBMA full search-based block matching algorithm
  • TSS three step search
  • NTS new three-step search algorithm
  • the motion vector may have a motion vector value of 1/2 or 1/4 pixel units based on the interpolated pixels.
  • the motion prediction unit may predict the current prediction unit by using a different motion prediction method.
  • various methods such as a skip method, a merge method, and an advanced motion vector prediction (AMVP) method may be used.
  • AMVP advanced motion vector prediction
  • the intra predictor 125 may generate a prediction unit based on reference pixel information around the current block, which is pixel information in the current picture. If the neighboring block of the current prediction unit is a block that has performed inter prediction, and the reference pixel is a pixel that has performed inter prediction, the reference pixel of the block that has performed intra prediction around the reference pixel included in the block where the inter prediction has been performed Can be used as a substitute for information. That is, when the reference pixel is not available, the unavailable reference pixel information may be replaced with at least one reference pixel among the available reference pixels.
  • a prediction mode may have a directional prediction mode using reference pixel information according to a prediction direction, and a non-directional mode using no directional information when performing prediction.
  • the mode for predicting the luminance information and the mode for predicting the color difference information may be different, and the intra prediction mode information or the predicted luminance signal information used for predicting the luminance information may be utilized to predict the color difference information.
  • the intra prediction method may generate a prediction block after applying an adaptive intra smoothing (AIS) filter to a reference pixel according to a prediction mode.
  • AIS adaptive intra smoothing
  • the type of AIS filter applied to the reference pixel may be different.
  • the intra prediction mode of the current prediction unit may be predicted from the intra prediction mode of the prediction unit existing around the current prediction unit.
  • the prediction mode of the current prediction unit is predicted by using the mode information predicted from the neighboring prediction unit, if the intra prediction mode of the current prediction unit and the neighboring prediction unit is the same, the current prediction unit and the neighboring prediction unit using the predetermined flag information If the prediction modes of the current prediction unit and the neighboring prediction unit are different, entropy encoding may be performed to encode the prediction mode information of the current block.
  • a residual block may include a prediction unit performing prediction based on the prediction units generated by the prediction units 120 and 125 and residual information including residual information that is a difference from an original block of the prediction unit.
  • the generated residual block may be input to the transformer 130.
  • the conversion unit 130 may convert the residual block including the residual data by using a conversion method such as DCT, DST, or the like.
  • the transformation method may be determined based on the intra prediction mode of the prediction unit used to generate the residual block.
  • the quantization unit 135 may quantize the values converted by the transformer 130 into the frequency domain.
  • the quantization coefficient may change depending on the block or the importance of the image.
  • the value calculated by the quantization unit 135 may be provided to the inverse quantization unit 140 and the reordering unit 160.
  • the reordering unit 160 may reorder coefficient values with respect to the quantized residual value.
  • the reordering unit 160 may change the two-dimensional block shape coefficients into a one-dimensional vector form through a coefficient scanning method. For example, the reordering unit 160 may scan a DC coefficient to a coefficient of a high frequency region by using a predetermined scan type and change it into a one-dimensional vector.
  • the entropy encoder 165 may perform entropy encoding based on the values calculated by the reordering unit 160. Entropy encoding may use various encoding methods such as, for example, Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC).
  • Entropy encoding may use various encoding methods such as, for example, Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC).
  • the entropy encoder 165 receives residual value coefficient information, block type information, prediction mode information, partition unit information, prediction unit information, transmission unit information, and motion of the coding unit from the reordering unit 160 and the prediction units 120 and 125.
  • Various information such as vector information, reference frame information, interpolation information of a block, and filtering information can be encoded.
  • the entropy encoder 165 may entropy encode a coefficient value of a coding unit input from the reordering unit 160.
  • the inverse quantizer 140 and the inverse transformer 145 inverse quantize the quantized values in the quantizer 135 and inversely transform the transformed values in the transformer 130.
  • the residual value generated by the inverse quantizer 140 and the inverse transformer 145 is reconstructed by combining the prediction units predicted by the motion estimator, the motion compensator, and the intra predictor included in the predictors 120 and 125. You can create a Reconstructed Block.
  • the filter unit 150 may include at least one of a deblocking filter, an offset correction unit, and an adaptive loop filter (ALF).
  • a deblocking filter may include at least one of a deblocking filter, an offset correction unit, and an adaptive loop filter (ALF).
  • ALF adaptive loop filter
  • the deblocking filter may remove block distortion caused by boundaries between blocks in the reconstructed picture.
  • it may be determined whether to apply a deblocking filter to the current block based on the pixels included in several columns or rows included in the block.
  • a strong filter or a weak filter may be applied according to the required deblocking filtering strength.
  • horizontal filtering and vertical filtering may be performed in parallel when vertical filtering and horizontal filtering are performed.
  • the offset correction unit may correct the offset with respect to the original image on a pixel-by-pixel basis for the deblocking image.
  • the pixels included in the image are divided into a predetermined number of areas, and then, an area to be offset is determined, an offset is applied to the corresponding area, or offset considering the edge information of each pixel. You can use this method.
  • Adaptive Loop Filtering may be performed based on a value obtained by comparing the filtered reconstructed image with the original image. After dividing the pixels included in the image into a predetermined group, one filter to be applied to the group may be determined and filtering may be performed for each group. For information related to whether to apply ALF, a luminance signal may be transmitted for each coding unit (CU), and the shape and filter coefficient of an ALF filter to be applied may vary according to each block. In addition, regardless of the characteristics of the block to be applied, the same type (fixed form) of the ALF filter may be applied.
  • ALF Adaptive Loop Filtering
  • the memory 155 may store the reconstructed block or picture calculated by the filter unit 150, and the stored reconstructed block or picture may be provided to the predictors 120 and 125 when performing inter prediction.
  • FIG. 2 is a block diagram illustrating an image decoding apparatus according to an embodiment of the present invention.
  • the image decoder 200 includes an entropy decoder 210, a reordering unit 215, an inverse quantizer 220, an inverse transformer 225, a predictor 230, 235, and a filter unit ( 240, a memory 245 may be included.
  • the input bitstream may be decoded by a procedure opposite to that of the image encoder.
  • the entropy decoder 210 may perform entropy decoding in a procedure opposite to that of the entropy encoding performed by the entropy encoder of the image encoder. For example, various methods such as Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC) may be applied to the method performed by the image encoder.
  • various methods such as Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC) may be applied to the method performed by the image encoder.
  • the entropy decoder 210 may decode information related to intra prediction and inter prediction performed by the encoder.
  • the reordering unit 215 may reorder the entropy decoded bitstream by the entropy decoding unit 210 based on a method of rearranging the bitstream. Coefficients expressed in the form of a one-dimensional vector may be reconstructed by reconstructing the coefficients in a two-dimensional block form.
  • the reordering unit 215 may be realigned by receiving information related to coefficient scanning performed by the encoder and performing reverse scanning based on the scanning order performed by the corresponding encoder.
  • the inverse quantization unit 220 may perform inverse quantization based on the quantization parameter provided by the encoder and the coefficient values of the rearranged block.
  • the inverse transform unit 225 may perform inverse transform on the inverse quantized transform coefficients using a predetermined transform method.
  • the transformation method may be determined based on information on a prediction method (inter / intra prediction), a size / shape of a block, an intra prediction mode, and the like.
  • the prediction units 230 and 235 may generate the prediction block based on the prediction block generation related information provided by the entropy decoder 210 and previously decoded blocks or picture information provided by the memory 245.
  • the predictors 230 and 235 may include a prediction unit determiner, an inter predictor, and an intra predictor.
  • the prediction unit determiner receives various information such as prediction unit information input from the entropy decoder 210, prediction mode information of the intra prediction method, and motion prediction related information of the inter prediction method, and distinguishes the prediction unit from the current coding unit, and predicts It may be determined whether the unit performs inter prediction or intra prediction.
  • the inter prediction unit 230 predicts the current prediction based on information included in at least one of a previous picture or a subsequent picture of the current picture including the current prediction unit by using information required for inter prediction of the current prediction unit provided by the image encoder. Inter prediction may be performed on a unit. Alternatively, inter prediction may be performed based on information of some regions pre-restored in the current picture including the current prediction unit.
  • the motion prediction method of the prediction unit included in the coding unit is skip mode, merge mode, or AMVP mode to perform inter prediction. You can judge.
  • the intra predictor 235 may generate a prediction block based on pixel information in the current picture.
  • intra prediction may be performed based on intra prediction mode information of the prediction unit provided by the image encoder.
  • the intra predictor 235 may include an adaptive intra smoothing (AIS) filter, a reference pixel interpolator, and a DC filter.
  • the AIS filter is a part of filtering the reference pixel of the current block and determines whether to apply the filter according to the prediction mode of the current prediction unit.
  • AIS filtering may be performed on the reference pixel of the current block by using the prediction mode and the AIS filter information of the prediction unit provided by the image encoder. If the prediction mode of the current block is a mode that does not perform AIS filtering, the AIS filter may not be applied.
  • the reference pixel interpolator may generate a reference pixel having an integer value or less by interpolating the reference pixel. If the prediction mode of the current prediction unit is a prediction mode for generating a prediction block without interpolating the reference pixel, the reference pixel may not be interpolated.
  • the DC filter may generate the prediction block through filtering when the prediction mode of the current block is the DC mode.
  • the reconstructed block or picture may be provided to the filter unit 240.
  • the filter unit 240 may include a deblocking filter, an offset correction unit, and an ALF.
  • Information about whether a deblocking filter is applied to a corresponding block or picture, and when the deblocking filter is applied to the corresponding block or picture, may be provided with information about whether a strong filter or a weak filter is applied.
  • the deblocking filter related information provided by the image encoder may be provided and the deblocking filtering of the corresponding block may be performed in the image decoder.
  • the offset correction unit may perform offset correction on the reconstructed image based on the type of offset correction and offset value information applied to the image during encoding.
  • the ALF may be applied to a coding unit based on ALF application information, ALF coefficient information, and the like provided from the encoder. Such ALF information may be provided included in a specific parameter set.
  • the memory 245 may store the reconstructed picture or block to use as a reference picture or reference block, and may provide the reconstructed picture to the output unit.
  • Intra prediction of the current block may be performed using a predetermined intra prediction mode and a reference sample.
  • the current block may be determined through partitioning based on a tree structure (eg, quadtree, binary tree).
  • the current block may be a coding block (CU) or a prediction block (PU).
  • the intra prediction may be performed in units of sub blocks constituting the current block according to a predetermined scan order.
  • the current block may consist of one or more subblocks.
  • the current block may be defined as a set of sub blocks that share one intra prediction mode.
  • the size / shape of the sub-block may be fixed pre-committed to the image encoding / decoding apparatus, or may be variably determined according to the size / shape of the current block or transform block.
  • the image encoding apparatus may encode and signal information indicating the size / shape of the subblock, and the image decoding apparatus may determine the size / shape of the subblock based on the signaled information.
  • the reference sample may be a sample neighboring the current block (or sub block).
  • the reference sample may belong to at least one of neighboring blocks located at the left, lower left, upper left, upper or upper right of the current block (or sub block).
  • the reference sample may include a reference sample for intra prediction of the current block (or sub block) and / or a sample generated through a predetermined reference sample generation process.
  • the scan order may be a fixed scan order (hereinafter, referred to as a "first scheme") pre-committed to the image encoding / decoding apparatus, and an adaptive scan order based on the intra prediction mode of the current block (hereinafter, " Second manner ". Any one of the first scheme and the second scheme may be selectively used. Information indicating whether the adaptive scan order is used for this may be signaled. For example, when the information is 0, the first scheme may be used, and when the information is 1, the second scheme may be used.
  • Either of the two schemes may optionally be used.
  • FIG. 3 illustrates an intra prediction based on a fixed scan order as an embodiment to which the present invention is applied.
  • the fixed scan order is a z scan and references a peripheral sample in the diagonal direction.
  • the peripheral sample may include at least one of a referenceable sample or a sample that is not referenceable or generated through a predetermined reference sample generation process.
  • the current block may consist of four sub blocks 310, 320, 330, and 340.
  • the prediction / restore may be performed in the order of the first sub block 310, the second sub block 320, the third sub block 330, and the fourth sub block 340.
  • the first sub block 310 may refer to the neighboring sample 311 (the sample indicated by the diagonal line) reconstructed before the first sub block.
  • the second sub-block 320 may be divided into an area of a sample (hereinafter referred to as "first area”) displayed in white and an area of a sample (hereinafter referred to as "second area”) displayed in gray shades.
  • the first region refers to a pre-restored peripheral sample 321 (sampled by oblique lines), and the second region refers to a sample 322 (sample filled with dots) that is not reconstructed or unreferenced. Area.
  • the sample of the second region is less spatially correlated with the sample 322, which may be a factor of poor performance of intra prediction.
  • the third sub-block 330 may be divided into a region of a sample (hereinafter referred to as "first region”) displayed in white and a region of a sample (hereinafter referred to as "second region”) represented in gray shades.
  • the first region refers to a pre-restored peripheral sample 331 (sampled by diagonal lines), and the second region refers to a sample 332 (filled with dots) that is not reconstructed or is not referenceable. Area.
  • the sample of the second region has a low spatial correlation with the sample 332, which may be a factor of lowering the performance of intra prediction.
  • the fourth sub-block 340 may be divided into a region of a sample (hereinafter referred to as "first region") displayed in white and a region of a sample (hereinafter referred to as "second region”) represented in gray shades.
  • the first region refers to a pre-restored peripheral sample 341 (sampled by oblique lines), and the second region refers to a sample 342 (sample filled with dots) that is not reconstructed or is not referenceable. Area.
  • the sample of the second region has a low spatial correlation with the sample 342, which may be a factor of poor performance of intra prediction.
  • FIG. 4 illustrates an intra prediction method based on an adaptive scan order as an embodiment to which the present invention is applied.
  • an intra prediction mode of a current block may be determined (S400).
  • the N intra prediction modes pre-defined in the image encoding / decoding apparatus may be grouped into a plurality of groups.
  • N may be an integer greater than or equal to 35.
  • the first group may be configured as a candidate mode (MPM, most probable mode), and the second group may be configured as a remaining mode except for the candidate mode among N intra prediction modes.
  • the candidate mode may be derived based on at least one of an intra prediction mode of a neighboring block or a default mode according to a rule pre- promised to an image encoding / decoding apparatus.
  • the number of candidate modes may be three, four, five, six, or more.
  • the intra prediction mode of the current block may be determined using information specifying the group to which the intra prediction mode of the current block belongs and / or information specifying the intra prediction mode of the current block in the group.
  • the scanning order of the current block may be determined based on the intra prediction mode determined in S400 (S410).
  • the scan order may be determined in consideration of whether the intra prediction mode is a non-directional mode or a directional mode. Alternatively, the scan order may be determined in consideration of the directionality / angle of the intra prediction mode. For example, the determining of the scan order may be implemented by determining a category of the intra prediction mode in consideration of the directionality of the intra prediction mode, and determining a scan order based on the determined category.
  • the category may be defined as a set of intra prediction modes having similar directionalities.
  • the N intra prediction modes pre-defined in the image encoding / decoding apparatus may be classified into a plurality of categories.
  • the image encoding / decoding apparatus may define a mapping relationship between a specific category and a scan order.
  • intra prediction of the current block may be performed (S420).
  • sub blocks of the current block may be sequentially predicted / restored.
  • Prediction and reconstruction may be performed on the priority subblock, and prediction and reconstruction may be performed on the subordinate subblock.
  • the subordinate subblock may refer to a neighboring sample of the current block and / or a reconstructed sample of the senior subblock. In this manner, subblocks belonging to the current block may be sequentially predicted and reconstructed.
  • FIG. 5 illustrates an example of a category relating to a scanning order as an embodiment to which the present invention is applied.
  • the category regarding the scan order may be classified into two, three, or more according to the directionality of the intra prediction mode pre-defined in the image encoding / decoding apparatus. Alternatively, the category may be classified based on the number, range, and / or location of samples referenced by the intra prediction mode of the current block.
  • the scan order available for each classified category may be defined.
  • a z scan, a z scan in a form rotated by a predetermined angle in a clockwise / counterclockwise direction, and the like may be used.
  • the predetermined angle may be 90 degrees, 180 degrees, -90 degrees, or -180 degrees.
  • the first category uses z scans
  • the second category uses z scans rotated 90 degrees counterclockwise
  • the third category uses z scans rotated 90 degrees clockwise. Can be used.
  • the number / type of the scan order may include the size of a block (eg, coding block, prediction block, transform block), the partition type of the block, the transform type (eg, DCT, DST), and the non-zero transform coefficient. It may be determined variably in consideration of the existence unit, whether the transform skip block, the quantization parameter, or the like. Alternatively, the number / type of the scan order may be preset in the image encoding / decoding apparatus.
  • FIG. 6 illustrates an intra prediction process according to a z scan in an adaptive scan order according to an embodiment to which the present invention is applied.
  • intra prediction when referring to the upper left peripheral sample in the 135-degree direction according to the direction of the intra prediction mode, intra prediction may be performed based on the z scan in the adaptive scan order. According to the z scan, prediction / restore may be performed in the order of the first sub block 610, the second sub block 620, the third sub block 630, and the fourth sub block 640.
  • the first sub block 610 may refer to a neighboring sample 611 (sample indicated by an oblique line) restored before the first sub block.
  • the peripheral sample of the second sub-block 620 may include a pre-restored peripheral sample 621 (sampled by diagonal lines) and an unreconstructed or non-referred sample 622 (sample filled with dots). However, the second sub-block 620 may be predicted / restored by referring to only the pre-restored neighbor sample 621 among the neighbor samples.
  • Peripheral samples of the third sub-block 630 may likewise include pre-restored periphery samples 631 (sampled by diagonal lines) and non-reconstructed or non-referred samples 632 (samples filled with dots). However, the third sub-block 630 may be predicted / restored by referring to only the pre-restored peripheral sample 631 among the peripheral samples.
  • Peripheral samples of the fourth sub-block 640 may also include pre-reconstructed periphery samples 641 (sampled by diagonal lines) and non-reconstructed or non-referred samples 642 (samples filled with dots). However, the fourth sub-block 640 may be predicted / restored by referring to only the pre-restored neighbor samples 641 among the neighbor samples.
  • one sub block may be divided into two non-square blocks.
  • a scan order for encoding / decoding of two non-square blocks may be determined based on the directionality of the intra prediction mode of the current block.
  • the first sub block 610 may be divided into a first sub block 612 and a second sub block 613 which are vertical square blocks.
  • encoding / decoding may be performed in the order of the first lower block 612 and the second lower block 613.
  • the prediction and the reconstruction of the first lower block 612 may be performed.
  • the second sub block 613 may refer to at least one of a peripheral sample of the first sub block 610 or a reconstruction sample of the first sub block 612.
  • the prediction on the second lower block 613 may be performed.
  • the second sub block 613 may refer to at least one of a neighboring sample of the first sub block 610 or a prediction sample of the first sub block 612.
  • the third sub block 630 may be divided into a third sub block 633 and a fourth sub block 634 which are horizontal square blocks.
  • encoding / decoding may be performed in the order of the third lower block 633 and the fourth lower block 634.
  • the prediction and the reconstruction of the fourth lower block 634 may be performed.
  • the fourth upper block 634 may refer to at least one of a surrounding sample of the third sub block 630 or a reconstructed sample of the third lower block 633.
  • the prediction on the fourth lower block 634 may be performed.
  • the fourth lower block 634 may refer to at least one of a neighboring sample of the third sub block 630 or a prediction sample of the third lower block 633.
  • FIG. 7 illustrates an intra prediction process according to a z-scan rotated 90 degrees counterclockwise in an adaptive scan sequence according to an embodiment to which the present invention is applied.
  • intra prediction is performed based on a z scan that is rotated 90 degrees counterclockwise in the adaptive scan order.
  • the first sub block 710, the second sub block 720, the third sub block 730, and the fourth sub block 740 are sequentially disposed.
  • Prediction / restore can be performed.
  • the first sub block 710 may be divided into an area of a sample (hereinafter referred to as "first area”) displayed in white and an area of a sample (hereinafter referred to as "second area”) represented in gray shades. have.
  • the first area is an area that references a referenceable or pre-restored peripheral sample (711, a sample indicated by an oblique line), and the second area is an unreconstructed or unreferenced sample (712, a sample filled with dots). This is an area that references.
  • the sample of the region 712 may be generated using one or more samples belonging to the region 711.
  • the sample of the second region may be predicted with reference to the generated sample of the region 712.
  • the second sub-block 720 may be predicted / restored with reference to a pre-restored neighbor sample 721 (sampled by diagonal lines).
  • the pre-restored peripheral sample 721 may include a reconstruction sample of the first sub block 710 adjacent to the bottom of the second sub block.
  • the third sub-block 730 may be divided into an area of a sample (hereinafter referred to as "first area”) displayed in white and an area of a sample (hereinafter referred to as "second area”) represented in gray shades.
  • the first area is an area that references a referenceable or pre-restored peripheral sample (731, a sample indicated by an oblique line), and the second area is an unreconstructed or unreferenced sample (732, a sample filled with dots). This is the area to refer to.
  • the sample of the region 732 may be generated using one or more samples belonging to the region 731.
  • the sample of the second region may be predicted with reference to the generated sample of the 732 region.
  • the fourth sub-block 740 may be predicted / restored with reference to a pre-restored peripheral sample 741 (sample indicated by an oblique line).
  • the pre-restored peripheral sample 741 may include reconstruction samples of the first to third sub-blocks adjacent to the fourth sub-block.
  • the second region referring to an unreconstructed or non-referred sample, such as the second sub-block 720 and the fourth sub-block 740. This can minimize the occurrence.
  • one sub block may be divided into two non-square blocks.
  • a scan order for encoding / decoding of two non-square blocks may be determined based on the directionality of the intra prediction mode of the current block.
  • the second sub block 720 may be divided into a first sub block 722 and a second sub block 723 which are horizontal square blocks.
  • encoding / decoding may be performed in the order of the first lower block 722 and the second lower block 723.
  • the second sub block 723 may refer to at least one of a peripheral sample of the second sub block 720 or a reconstruction sample of the first sub block 722.
  • prediction on the second lower block 723 may be performed.
  • the second sub block 723 may refer to at least one of a neighboring sample of the second sub block 720 or a prediction sample of the first sub block 722.
  • FIG. 8 illustrates an intra prediction process according to a z scan rotated 90 degrees clockwise in an adaptive scan order according to an embodiment to which the present invention is applied.
  • intra prediction may be performed based on a z scan that is rotated 90 degrees clockwise in the adaptive scan order. have. According to the z scan rotated 90 degrees in the clockwise direction, the first sub block 810, the second sub block 820, the third sub block 830, and the fourth sub block 840 are predicted. Restore may be performed.
  • the first sub-block 810 may be predicted / restored with reference to a pre-restored peripheral sample 811 (sample indicated by an oblique line).
  • the second sub-block 820 may be divided into an area of a sample (hereinafter referred to as "first area”) displayed in white and an area of a sample (hereinafter referred to as "second area”) displayed in gray shades.
  • the first area is an area that references a referenceable or pre-restored peripheral sample 821 (sampled by oblique lines), and the second area is an unreconstructed or unreferenced sample (822, sample filled with dots). This is the area to refer to.
  • the sample of the 822 region may be generated using one or more samples belonging to the 821 region.
  • the sample of the second region may be predicted with reference to the generated sample of the 822 region.
  • the third sub-block 830 may be predicted / restored with reference to a pre-restored peripheral sample 831 (sampled by diagonal lines).
  • the pre-restored peripheral sample 831 may include a reconstructed sample of the first sub block 810 adjacent to the left side of the third sub block.
  • the fourth sub-block 840 may be predicted / restored with reference to a pre-restored peripheral sample 841 (a sample indicated by an oblique line).
  • the pre-restored peripheral sample 841 may include reconstructed samples of the first to third sub-blocks adjacent to the fourth sub-block.
  • the second region referring to an unreconstructed or unreferenced sample, such as the third subblock 830 and the fourth subblock 840. This can minimize the occurrence.
  • one sub block may be divided into two non-square blocks.
  • a scan order for encoding / decoding of two non-square blocks may be determined based on the directionality of the intra prediction mode of the current block.
  • the third sub block 830 may be divided into a first sub block 832 and a second sub block 833, which are vertical non-square blocks.
  • encoding / decoding may be performed in the order of the first lower block 832 and the second lower block 833.
  • the second lower block 833 may refer to at least one of a peripheral sample of the third sub block 830 or a reconstructed sample of the first sub block 832.
  • the prediction on the second lower block 833 may be performed.
  • the second sub block 833 may refer to at least one of a neighboring sample of the third sub block 830 or a prediction sample of the first sub block 832.
  • FIG. 9 illustrates an inter prediction method based on a current picture reference mode according to an embodiment to which the present invention is applied.
  • the current picture reference mode is a method of performing motion compensation based on a reference block in which the current block belongs to the same picture as the current block. This may be distinguished from an inter mode in which motion compensation is performed based on a reference block belonging to a picture different from the current block. To distinguish the information, information indicating whether the current block is a block coded in the current picture reference mode may be encoded / decoded. Or, if the picture specified by the reference picture index of the current block is the current picture, the current block may be determined to be a block encoded in the current picture reference mode. The current picture may be arranged at a predetermined position in the reference picture list.
  • the predetermined position may be a position previously promised to the image encoding / decoding apparatus or may be any position like other reference pictures.
  • the current picture may be arranged before the short-term reference picture, between the short-term reference picture and the long-term reference picture, or after the long-term reference picture.
  • a reference block of the current block may be determined based on the motion vector of the current block (S900).
  • the reference block When the current block is a block coded in the current picture reference mode, the reference block may belong to the same picture as the current block. On the other hand, when the current block is in the inter mode, it may belong to a picture different from the current block.
  • the motion vector may be derived from a neighboring block of the current block.
  • the neighboring block may mean a block spatially and / or temporally adjacent to the current block.
  • the spatial neighboring block may include at least one of blocks adjacent to a left side, an upper end, a lower left end, an upper left end, or a right upper end of the current block.
  • the temporal neighboring block may include at least one of a block at a same position as the current block, a block adjacent to a left side, a top side, a right side, a bottom side, or a corner of the same position block.
  • the motion vector may be derived using a neighboring block that satisfies a predetermined condition among the neighboring blocks.
  • a predetermined condition include whether the same prediction mode as the current block (for example, current picture reference mode, inter mode, etc.), whether to use the same reference picture list as the current block, and the same reference picture as the current block. Whether it is a reference.
  • the motion vector may be determined based on template matching.
  • the template matching is a process of specifying a peripheral area (hereinafter, referred to as a "template") of the current block and searching for a block having a template most similar to the template of the current block.
  • the search may be performed in all or some of the pre-restored regions in the current picture, or may be performed in a picture of a different time zone than the current picture.
  • the motion vector may be derived in consideration of the picture type of the current picture, the frequency of the motion vector for the current picture reference mode, etc., which will be described in detail with reference to FIG. 10.
  • motion compensation of the current block may be performed based on the reference block determined in S900 (S910).
  • the reference block may be a block composed of an integer pel or may be a block composed of a small number of pels.
  • a filtered reference block may be generated by performing predetermined filtering on the reference block, and motion compensation may be performed using the filtered reference block.
  • the filtering may be performed based on a weighted filter that changes a sample value by applying a predetermined weight to the sample value of the reference block, or may be performed based on an interpolation filter that generates a prime pel by interpolating the sample of the reference block. It may be.
  • the image encoding apparatus may encode and signal filter information for filtering, and the image decoding apparatus may filter a reference block based on the signaled filter information.
  • the number of filters used for the filtering may be one, two, three, or more.
  • the filter may be a fixed coefficient filter pre-committed to the image encoding / decoding apparatus, or may be a variable coefficient filter.
  • the image encoding apparatus may encode and signal information indicating whether the variable coefficient filter is used, and the image decoding apparatus may determine whether to use the variable coefficient filter based on the signaled information.
  • Coefficients of the variable coefficient filter may be determined based on coefficients signaled from the image encoding apparatus, or may be derived based on one or more samples of the current block and / or one or more samples of the neighboring block.
  • the coefficients of the variable coefficient filter may be derived from coefficients of the filter used before the current block, or may be derived based on pre-defined coefficients at a higher level such as a sequence and a picture. The coefficients may differ depending on the location of the sample being filtered.
  • either half pel or quarter pel may be selectively used. If the precision of the minority pel is selected to be 1/2 pel, produce 1/2 pel located between two integer fels, and if the precision of the minority pel is selected to 1 ⁇ 4 pel, 1 / 4 pellets can be produced.
  • the resulting minority pels may be produced using a plurality of samples located on the same vertical line and / or horizontal line. In this case, the plurality of samples may include at least one of an integer fel or pre-generated minor fel. The selection may be performed based on the encoded information to specify the precision of the minority pels. Alternatively, the pre- promised precision may be fixedly used in the image encoding / decoding apparatus.
  • the precision of the aforementioned 1/2 pel, 1/4 pel is only one embodiment, and can be expanded to 1/8 pel, 1/16 pel, and the like.
  • the motion compensation process of S910 may further include scaling the reference block or rotating the predetermined block by a predetermined angle.
  • the scaling or rotation is for transforming the reference block to a size / shape similar to the current block. This may be done before or after the filtering process described above.
  • at least one of the above-described filtering, scaling, or rotation may be omitted.
  • FIG. 10 illustrates a method of deriving a motion vector of a current block encoded in the current picture reference mode according to an embodiment to which the present invention is applied.
  • the motion vector of the current block encoded in the current picture reference mode may be derived from a predetermined motion candidate list. This may be performed when the current block belongs to an intra random access point (IRAP) picture.
  • IRAP intra random access point
  • the motion candidate list may include a motion vector having a high frequency among the motion vectors for the current picture reference mode.
  • the range of motion vectors that can be included in the motion candidate list may be determined based on at least one of a search range of a reference block for the current picture reference mode or whether WPP (Wavefront Parallel Processing) is used.
  • WPP Widefront Parallel Processing
  • the range of motion vectors that can be included in the motion candidate list may be limited to motion vectors in a region already decoded through WPP, or to motion vectors within a search range of a reference block for the current picture reference mode. .
  • the current block may be determined whether the current block is a block encoded in the current picture reference mode (S1000). As shown in FIG. 9, the determination may be performed based on information indicating whether the current block is a block coded in the current picture reference mode or may be determined based on a reference picture index of the current block.
  • the current block When the current block is a block encoded in the current picture reference mode, it may be determined whether the current picture to which the current block belongs is an IRAP picture (S1010).
  • a motion vector may be derived based on the above-described motion candidate list (S1020). On the other hand, if the current picture is not an IRAP picture, a motion vector may be derived from a neighboring block (S1030).
  • FIG. 11 illustrates a method of filtering a reference block according to an embodiment to which the present invention is applied.
  • the precision of the minority pels regarding the filtering of the reference block (S1100).
  • the precision of the minority pel 1/2 pel, 1/4 pel, 1/8 pel, 1/16 pel and the like can be used.
  • the precision of the minority pel may be determined based on the encoded information to specify the precision of the minority pel with respect to the filtering.
  • the precision of the minority pel may be a pre-committed precision of the image encoding / decoding apparatus, and in this case, the execution of step S1100 may be omitted.
  • the coefficient of the filter may be obtained (S1120).
  • the coefficient may be obtained through the bitstream or derived using the surrounding samples. Alternatively, the coefficient may be derived from the filter coefficient used before the current block.
  • the reference block may be filtered based on the coefficient obtained in S1120 (S1130).
  • the reference block may be filtered based on a fixed coefficient filter pre-committed to the image encoding / decoding apparatus (S1140).
  • the present embodiment does not limit the temporal order of determining the precision of the minority pel and determining whether the variable coefficient filter. Determining the precision of the minority pel may be performed after determining whether it is a variable coefficient filter or may be performed independently of each other.
  • FIG. 12 illustrates a form of a current block coded in a current picture reference mode according to an embodiment to which the present invention is applied.
  • the current picture reference mode may be used.
  • the current picture reference mode may be used.
  • blocks 1210 and 1230 are blocks divided into non-squares, and blocks 1220 and 1240 are blocks divided into arbitrary shapes.
  • the block 1230 may use the block 1210 as a reference block, and the block 1240 may use the block 1220 as a reference block. In this case, the block 1220 may be rotated at a predetermined angle.
  • the current picture reference mode may be limitedly used. For example, when the size of the current block is larger than the threshold size, the current picture reference mode may not be allowed. Or, if the partition type of the current block is NxM, the current picture reference mode may not be allowed. In this case, N and M are integers greater than 0, and may be the same as or different from each other.
  • the NxM may be pre-committed to the image encoding / decoding apparatus, or may be derived based on coded information to indicate a block size / shape in which the current picture reference mode is allowed.
  • FIG. 13 illustrates an interpolation based intra prediction process according to an embodiment to which the present invention is applied.
  • a neighboring sample for intra prediction of a current block may be specified (S1300).
  • the peripheral sample may belong to a block adjacent to the left, lower left, upper left, upper or right upper end of the current block. If there is one of the surrounding samples that has not yet been restored or is not referenceable, it may be replaced with a pre-restored or referenceable sample of the surrounding samples.
  • Predetermined filtering may be performed on the specified peripheral sample (S1310).
  • the filtering is a process of generating a filtered surrounding sample of integer precision by applying a predetermined weight to the surrounding sample of integer precision.
  • the filtering may be selectively performed based on an intra prediction mode of the current block, a block size, a change amount of neighboring neighboring samples, and the like.
  • An interpolation filter may be applied to the filtered neighboring samples to generate a reference sample for intra prediction (S1320).
  • Whether to apply the interpolation filter may be determined based on an encoded flag to indicate whether to apply the interpolation filter.
  • the flag may be signaled at at least one level of a sequence, picture, slice, or block.
  • whether to apply the interpolation filter may be determined by further considering an intra prediction mode of the current block. For example, when the intra prediction mode refers to a mode that references an integer precision sample (eg, planar mode, DC mode, horizontal mode, or vertical mode), an interpolation filter may not be applied to the surrounding samples.
  • interpolation filter may be a linear interpolation filter, a cube interpolation filter, a Gaussian interpolation filter, or the like.
  • the image encoding / decoding apparatus may define a plurality of interpolation filters, and any one of them may be selectively used.
  • the interpolation filter may be determined in consideration of at least one of the size of the current block or the intra prediction mode.
  • the current block may be a coding block (CU), a prediction block (PU), or a transform block (TU).
  • the block size may be expressed as a width / height of a block, a sum of width and height, an average value of width and height, and the number of samples belonging to the block.
  • a first interpolation filter may be applied to a block smaller than a predetermined threshold size, and a second interpolation filter may be applied to a block larger than or equal to the threshold size. At least one of the filter coefficient, the number of taps, and the filter strength may be different from each other in the first / second interpolation filter.
  • the first interpolation filter may be any one of the above-described types of interpolation filters, and the second interpolation filter may be the other.
  • the threshold size may be predetermined in the image encoding / decoding apparatus, or may be variably determined in consideration of a specific encoding parameter.
  • the same interpolation filter may be applied to all block sizes, or different interpolation filters may be applied to each block size.
  • the intra prediction modes pre-defined in the image encoding / decoding apparatus may be classified into a plurality of groups in consideration of the directionality of the intra prediction modes.
  • the pre-defined intra prediction mode may be classified into a first group having a first direction, a second group having a second direction, a third group having a third direction, and the like.
  • the number of groups may fall in the range of 1 to the number of pre-defined intra prediction modes.
  • Each group may be configured with one or more intra prediction modes.
  • the plurality of intra prediction modes belonging to each group may have similar directions.
  • An interpolation filter may be determined based on the directionality of the intra prediction mode.
  • the image encoding apparatus may encode and signal information for determining the interpolation filter, and the image decoding apparatus may determine the interpolation filter based on the signaled information.
  • the information may be signaled at at least one of a sequence, picture, slice, or block level.
  • Determining the interpolation filter may mean determining at least one of a filter coefficient, a filter strength, a number of taps, or a type of the interpolation filter.
  • Intra-prediction of the current block may be performed based on the generated reference sample (S1330).
  • the reference sample may be set as a prediction sample of the current block.
  • the current block may be reconstructed by adding the decoded residual sample to the prediction sample.
  • the reference sample may be set as a reconstruction sample of the current block. In this case, the residual signal for the current block may not be signaled or restored.
  • FIG. 14 illustrates a method of applying an interpolation filter as an embodiment to which the present invention is applied.
  • An interpolation filter may be applied to a plurality of neighboring samples adjacent to the current block to generate a reference sample for intra prediction.
  • the peripheral sample may include at least one of an integer precision sample or a decimal precision sample.
  • the number of surrounding samples to which the interpolation filter is applied may be two, three, four, five, six, or more.
  • the number of neighboring samples may be variably determined based on at least one of an intra prediction mode of a current block or a position of a sample to be predicted / restored in the current block.
  • the number of neighboring samples may be a fixed number pre-committed to the image encoding / decoding apparatus.
  • the position of the neighboring sample may be determined based on at least one of the intra prediction mode of the current block or the position of the sample to be predicted / restored in the current block.
  • neighboring samples 1431 and 1432 having integer precision may be specified based on a position of a sample to be predicted / restored in the current block 1410 and an intra prediction mode of the current block.
  • the reference samples 1420 may be generated between the peripheral samples 1431 and 1432 by interpolating the peripheral samples 1431 and 1432.
  • the reference sample 1420 may be a real precision sample.
  • the location of the reference sample may be specified based on at least one of a location of a sample to be predicted / restored in the current block 1410 or an intra prediction mode of the current block.
  • interpolation sample position may have real precision.
  • the number of interpolation sample positions is N, and N may be an integer greater than one. Based on the intra prediction mode of the current block, a position where a reference sample is generated among the interpolated sample positions may be determined.
  • the position of the reference sample 1420 generated through interpolation is 13/32, and a reference sample may be generated by applying an interpolation filter to P0 1431 and P1 1432 based on the position.
  • FIG. 15 illustrates an example of an interpolation filter using a plurality of taps as an embodiment to which the present invention is applied.
  • the number of taps of the interpolation filter of the present invention may be determined based on at least one of the size of the current block, whether the intra prediction mode is a directional mode, the directionality / angle of the intra prediction mode, or information encoded to specify the number of taps. have.
  • the number of taps of the interpolation filter may be two, three, four, five, six, or more. Hereinafter, for convenience of description, the case of four or six tabs will be described respectively.
  • Reference samples 1520 for intra prediction may be generated between the four neighboring samples.
  • the two peripheral samples may be adjacent samples adjacent to each other or may be arranged discontinuously.
  • the interpolated reference sample 1520 may have real precision.
  • the interpolation filter may be applied to the four peripheral samples to generate a reference sample 1520.
  • neighboring samples of integer precision (1561, 1562, 1563, 1564, 1565, 1566) based on at least one of a position of a prediction / restore target sample in the current block 1540 or an intra prediction mode of the current block.
  • the two peripheral samples may be adjacent samples adjacent to each other or may be arranged discontinuously.
  • Peripheral samples P0 (1561), P1 (1562) with six integer precisions to which an interpolation filter is applied based on at least one of the position of the predicted / restored sample in the current block 1540 or the intra prediction mode of the current block.
  • the positions of P2 1563, P3 1564, P4 1565, and P5 1566 may be determined. Further, based on at least one of the position of the predicted / restored sample in the current block 1540 or the intra prediction mode of the current block, the position of the reference sample 1550 interpolated between P2 1563 and P3 1564 is determined. Can be determined.
  • the interpolated reference sample 1550 may have real precision.
  • the interpolation filter may be applied to the four peripheral samples to generate a reference sample 1550.
  • Exemplary methods of the present disclosure are represented as a series of operations for clarity of description, but are not intended to limit the order in which the steps are performed, and each step may be performed simultaneously or in a different order as necessary.
  • the illustrated step may further include other steps, may include other steps except some, or may include additional other steps except some.
  • various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof.
  • one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), General Purpose It may be implemented by a general processor, a controller, a microcontroller, a microprocessor, and the like.
  • scope of the disclosure include software or machine-executable instructions (eg, an operating system, an application, firmware, a program, etc.) to cause an operation in accordance with various embodiments of the method to be executed on an apparatus or a computer, and such software or Instructions, and the like, including non-transitory computer-readable media that are stored and executable on a device or computer.
  • software or machine-executable instructions eg, an operating system, an application, firmware, a program, etc.
  • the present invention can be used to encode / decode video signals.

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CN201780038491.0A CN109417637B (zh) 2016-04-26 2017-04-19 用于编码/解码图像的方法和设备
EP17789837.6A EP3451668A4 (en) 2016-04-26 2017-04-19 METHOD AND DEVICE FOR CODING / DECODING AN IMAGE
CN202111349451.2A CN114189682A (zh) 2016-04-26 2017-04-19 图像解码方法、图像编码方法以及传输比特流的方法
CN202111347573.8A CN114189679A (zh) 2016-04-26 2017-04-19 图像解码方法、图像编码方法以及传输比特流的方法
US16/096,704 US11368682B2 (en) 2016-04-26 2017-04-19 Method and device for encoding/decoding image
CN202111347576.1A CN114189680A (zh) 2016-04-26 2017-04-19 图像解码方法、图像编码方法以及传输比特流的方法
EP21171150.2A EP3968634A1 (en) 2016-04-26 2017-04-19 Method and device for encoding/decoding image
CN202111349439.1A CN114189681A (zh) 2016-04-26 2017-04-19 图像解码方法、图像编码方法以及传输比特流的方法
CN202111347572.3A CN114189678A (zh) 2016-04-26 2017-04-19 图像解码方法、图像编码方法以及传输比特流的方法
US17/747,309 US11882275B2 (en) 2016-04-26 2022-05-18 Method and device for encoding/decoding image
US18/351,775 US20230362365A1 (en) 2016-04-26 2023-07-13 Method and device for encoding/decoding image
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